Nobody counts Liberty Square as a true "land" these days. It's just a junction point to get from Fantasyland to Frontierland. Thus, the Haunted Mansion technically does not reside in a land...it's kind of just off by itself doing its own thing.
Then I found
this article over at Imaginerding. Apparently, the original concept for Liberty Square was going to have it more akin to its New Orleans counterpart over at Disneyland. You would actually be in the center of a bustling New England town, circa 1776.
However....budgets got in the way, and as a result a lot of what was planned never made it. The only piece added to LS was Liberty Square Market/Glorified Picnic Area.
I say...
1. Start plussing the little backside bit of LS that nobody pays attention to. If you're walking to Adventureland from the Hub...look to your right and you will see a smaller bridge going to the backside. There's nothing much there right now...just the back entrance to the Christmas Shop and the Silhouette portrait studio. Plus the hell out of it...make it something worth something.
2. Re-theme the Diamond Horseshoe to Liberty Square.
Disney considers DH to be Liberty Square real estate. In the words of Jean-Luc Picard, "MAKE IT SO!"
3. Tear down Liberty Square Market/Glorified Picnic Area. Then build what was planned to make it a more immersive environment.
Photo lovingly borrowed/blatantly ripped off from George Taylor at Imaginerding.
I also wouldn't mind Hall of Presidents being gutted and turned something substantial (43 Presidents, but only three speak...the other just nod heads, get fidgety in their seats, or whisper to each other)....but a lack of space makes that impossible without killing Peter Pan or Philharmagic.